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Defect Structure of Sb2-xFexTe3 Single Crystals
Authors: Horák Jaromír | Lošťák Petr | Drašar Čestmír | Navrátil Jiří | Uher
Year: 2007
Type of publication: článek v odborném periodiku
Name of source: Journal of Solid State Chemistry
Publisher name: Academic Press (Elsevier)
Page from-to: 915-921
Titles:
Language Name Abstract Keywords
cze Bodové poruchy v monokrystalech Sb2-xFexTe3 Monokrystaly Sb2-xFexTe3 byly připraveny modifikovanou Bridgmannovou metodou. Z měření reflektivity v okolí plasmové hrany vyplývá, že Fe zvyšuje koncentraci děr (akceptorové chování). Každý atom Fe produkuje 0.4-0.5 díry. Na základě modelu bodových poruch je předpokládáno, že atomy Fe tvoří nenabité substituční poruchy. Atomy Fe pravděpodobně interagují s nativními defekty v Sb2Te3. Sb2Te3;bodové poruchy;optické vlastnosti
eng Defect Structure of Sb2-xFexTe3 Single Crystals Single crystals of Sb2Te3 doped with Fe were prepared by Bridgman method. The interpretation of the reflection spectra in plasma resonance region indicates that Fe increases the concentration of holes (acceptor) and each Fe atom incorporated in Sb2Te3 structure liberates 0.4 ? 0.5 hole. Observed effect is elucidated by means of point defect model. According to the model Fe atoms enter the structure and form uncharged substitutional defects . Since this defect can not affect the free carrier concentration directly, we assume an interaction of the entering Fe-atoms with natives defects leading to a rise in the concentration of antisite defects , to a decrease of concentration, and to an increase in the concentration of holes. Antimony telluride;Defect structure;Optical properties